Frost Dates for 52806 — Davenport, Iowa

Half of springs at Davenport, IA see their last 32°F night by April 23; only one in ten is past it by April 8, and one in ten still has one after May 8. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 3 20%, and after May 8 10%. The 15 days between the even-odds date and the one-in-ten date is wider than at 82% of the 132 Iowa stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 15 in half of years, as early as October 1 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 9 days later, around October 24; in spring the one-in-ten date for 28°F is April 30, 8 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, longer than at 79% of the 132 Iowa stations; it reaches 193 days one year in ten and falls short of 153 one year in ten. On average 136 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 9 days longer, to about May 2, and return around October 4. Severe cold of 16°F or below comes every winter, usually between November 22 and March 13.

July is the warmest month at Davenport, IA, averaging 84°F by day and 64°F at night; January is the coldest at 30°F and 14°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 29% of years.

Warmth for growing adds up to 3,209 growing degree days a year (base 50°F), more than at 73% of the 132 Iowa stations. 36% of them (1,164) have built up by the end of June, and July adds the most, 735. Precipitation totals 36.1 inches a year, most in May (4.8") and least in January (1.1"); May to September bring 58% of it.

The nearest other station, Davenport WFO, IA, 3 miles northeast of Davenport, has a last frost 2 days earlier (April 21), a first frost 2 days later (October 17), a season 2 days longer.

The first measurable snow (0.1 inch or more) in Davenport usually arrives around November 24, and the last of the season around March 24. Those are the middle dates across the winters of 1991–2020 at Moline Quad City International Airport, IL, 8.6 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 30 days after the last snow.

ZIP 52806 is 3 miles from Davenport, IA, which stands at 754 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 52806 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.